Baseten Sandboxes alternatives
The 6 alternatives below are grouped by kind of sandbox, and each says what it does differently from Baseten Sandboxes. Start from whatever made you look: missing GPUs, session limits, self-hosting, pricing or isolation.
Why teams look beyond Baseten Sandboxes
An early, Blaxel-derived sandbox inside the Baseten platform that is attractive to existing customers but still thin on pricing and isolation detail.
- Isolation technology is not named in the docs
- No published paid pricing; only a free period until 16 November
- Concurrency limited to 10 per organisation by default
- No egress controls, snapshots or compliance statements documented for sandboxes
Baseten Sandboxes alternatives, by kind
Hosted sandbox platforms
SDK-driven sandboxes you create, run code in and destroy through an API.
Blaxel
Perpetual microVM sandboxes for AI agents that drop to standby when idle and resume with memory intact, plus volumes, batch jobs and MCP hosting.
- MicroVM
- BYOC
- Pause/resume
How it differs: Always-available agents that sit idle most of the time and need near-instant resume. A strong design for always-on, mostly-idle agents; watch how the Baseten acquisition shapes the roadmap.
Persistent VMs and agent computers
Full, long-lived virtual machines that an agent keeps, forks and returns to.
Fly.io Sprites
Persistent, hardware-isolated Linux computers for AI agents with a durable 100 GB disk, checkpoints, and no compute charges while idle.
- MicroVM
- Pause/resume
How it differs: Long-running, stateful agent computers that should cost nothing while idle. The most natural “persistent computer per agent” model, with idle-free billing.
Compute platforms with sandboxes
General serverless or app platforms that also offer sandboxes, often with GPUs.
Beam Sandboxes
Serverless AI compute platform whose sandboxes are gVisor-isolated containers with memory snapshots, optional GPUs and an open-source, self-hostable runtime.
- gVisor
- Open source
- Self-hostable
- BYOC
- GPU
- Pause/resume
How it differs: Teams that want an open-source, self-hostable sandbox runtime with GPU access. A cost-effective GPU sandbox with an open runtime; best for trusted or semi-trusted code.
Koyeb Sandboxes
Ephemeral microVM sandboxes on Koyeb’s serverless platform for AI-generated code, with CPU or GPU and scale-to-zero.
- MicroVM
- GPU
How it differs: Teams already on Koyeb or in the Mistral ecosystem that want GPU-capable ephemeral sandboxes. Promising GPU-capable microVMs, but still preview — evaluate as it matures within Mistral.
Modal Sandboxes
Sandboxes on Modal’s serverless compute platform for running untrusted code at very high scale, with GPUs, snapshots and tunnels.
- gVisor or VM
- GPU
- Pause/resume
How it differs: High-concurrency and GPU-backed sandboxes — RL rollouts, evals and coding agents at scale. The best fit when scale or GPUs matter most, especially for teams already on Modal.
Northflank Sandboxes
Sandboxes on Northflank’s Kubernetes-based platform — microVMs for CPU work, gVisor for GPUs — on Northflank’s cloud or in your own cloud account.
- Cloud Hypervisor microVM
- BYOC
- GPU
- Pause/resume
How it differs: Teams that want sandboxes in their own cloud account (BYOC) alongside app hosting, databases and GPUs. Compelling for BYOC and all-in-one platform needs; review the October 2026 incident response before adopting.
Baseten Sandboxes vs alternatives
| Sandbox | Isolation | Open source | Self-host / BYOC | Cold start (vendor) | Max session | Snapshots / pause | GPU | SDKs |
|---|---|---|---|---|---|---|---|---|
| Baseten Sandboxes | Not named (Blaxel-based) | No | No / No | Not documented | 7 days default | No / Yes | Not documented | Python, JavaScript/TypeScript, Go, CLI, REST API, MCP server |
| Beam Sandboxes | gVisor | Yes | Yes / Yes | ~0.5 s | Configurable | Yes / Yes | Yes | Python, TypeScript |
| Blaxel | MicroVM | No | No / Yes | <25 ms resume | Unlimited (standby) | Yes / Yes | Not documented | TypeScript, Python, Go |
| Fly.io Sprites | MicroVM | No | No / No | 0.1–2 s wake | Unlimited | Yes / Yes | No | JavaScript/TypeScript, Go, Python, Elixir |
| Koyeb Sandboxes | MicroVM | No | No / Not documented | Not documented | Up to 24 h | Not documented / Not documented | Yes | Python, JavaScript/TypeScript |
| Modal Sandboxes | gVisor or VM | No | No / Not documented | <1 s | Up to 24 h | Yes / Yes | Yes | Python, JavaScript/TypeScript, Go |
| Northflank Sandboxes | Cloud Hypervisor microVM | No | No / Yes | <1 s | Unlimited | Not documented / Yes | Yes | JavaScript/TypeScript, Python |
Frequently asked questions
What are the main alternatives to Baseten Sandboxes?
Is there an open-source alternative to Baseten Sandboxes?
Cite this page
Agent Sandboxes. (2026). Baseten Sandboxes alternatives. agentsandboxes.org. Last reviewed November 9, 2026. https://agentsandboxes.org/alternatives/baseten-sandboxes/
Found an error or a missing sandbox? Submit a correction — every entry links to the sources it relies on.